IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
artículos
Título:
Interindividual variability in reproductive success and somatic growth in Cichlasoma dimerus (HEKEL, 1840)?
Autor/es:
DELGADÍN TH; PEREZ SIRKIN, DANIELA; KARP, PAOLA; FOSSATI, MARIANA; VISSIO, P
Revista:
BELGIAN JOURNAL OF ZOOLOGY
Editorial:
SOC ROYALE ZOOLOGIQUE BELGIQUE
Referencias:
Lugar: Bruselas; Año: 2014 vol. 144 p. 102 - 111
ISSN:
0777-6276
Resumen:
Environmental factors and social interactions are known to affect somatic growth and 4 reproduction in teleost fish. It has been described for Cichlasoma dimerus that only one pair is 5 formed under a wide range of laboratory conditions. However, this is not observed in tanks 6 composed of 3 males and 3 females, where multiple pair formation occurs. Thus, our 7 objective was to evaluate somatic growth and reproductive performance in C.dimerus under 8 this particular condition, in which more than one pair is expected to be formed. A clear sexual 9 growth dimorphism, with males growing faster than females, and multiple pair formation, 10 sometimes simultaneously, were observed. Both features were absent in previous studies with 11 other aquaria structures. Additionally, there was a significant association between 12 reproductive events and body size, where the bigger the fish, both male and female, the higher 13 the number of reproductive events. Despite the sexual growth dimorphism, no differences 14 were observed in the members of the somatic growth axis IGF-I and GHR2 mRNA levels 15 between males and females. The results obtained for this social species show a high 16 interindividual variability in the aquaria in regard to reproductive success and growth. This 17 may have implications on experimental design, where a low level of heterogeneity between 18 fish is desirable. If this variability is not taken into account, possible treatment effects may be 19 not detected.